Phosphorus physical/chemical constants

An important advantage in phosphorus systems is the fact that 31P, which is the only natural isotope, has a spin of and can be easily measured by NMR. Its characteristic chemical shifts 8 (p.p.m.) and its H and 13C coupling constants J (Hz) have influenced the development of the heterocyclic chemistry of phosphorus more than any other physical methods such as IR, UV, MS, dipole moment measurement and others. 

Meek and Drago8 showed that the reaction between tetramethylammonium chloride and iron(III) chloride can take place just as readily in triethyl phosphate, OP(OEt), as in phosphorus oxychloride, OPCl,. They suggested that the similarities in physical properties of the two solvents, principally the dielectric constant, were more impor tant in this reaction than the difference in chemical properties, namely, the presence or absence of autoionization to form chloride ions.9... 

Physical and Chemical Properties. Data such a log Kow, log Koc, and the Henry s law constant needed for estimating the environmental transport of elemental phosphorus are available (see Table 3-2). However, an experimentally determined and reliable log Koc value for elemental phosphorus would be helpful. 

---